Pragmatist philosopher John Dewey made a distinction that most productivity frameworks quietly ignore: the difference between *inquiry* — genuinely questioning whether your framework fits reality — and *justification* — marshaling evidence to defend what you already believe. The trouble is, both feel identical from the inside. A mental model that once sharpened your decisions can quietly shift into a lens that filters out the data threatening to replace it. Dewey called this the difference between a live inquiry and a closed case — and the closed case always feels like confidence. The practical move isn't to distrust your best models; it's to build in a specific moment where you play devil's advocate against them rather than with them — treat each model as a hypothesis still on trial, not a tool that earned permanent tenure.

Which of your most trusted mental models has gone the longest without serious challenge — and what evidence would have to appear before you'd actually retire it?

Drawing from American Pragmatism — John Dewey (Logic: The Theory of Inquiry, 1938)